I receive the following message when login in to my PayPal account.
T"this site uses a plug-in (Silverlight)that will soon be unsupported". ...
+1 to what @leocg wrote. I just now successfully logged in to PayPal on a system that has no Silverlight installed at all. Are you trying to log in directly from a known-good PayPal login link or from a link in some eMail or referring website?
I'm in the US, so it's possible there are some server variations for different world regions, though I strongly doubt that for a company operation the size of PayPal.